In New Rochelle, more than a dozen attacks have been reported since the new year. One at them happened in the back of a Chase Bank, where a teen was beaten and robbed.

Another attack occurred Thursday night in nearby Harrison. A man had to be treated in an ambulance after being held up at gunpoint and assaulted. Again, it happened just blocks from the train.

“I think it has something to do with the economy. It seems like there’s a rash of robberies — the likes of which we haven’t seen in Westchester,” said Jack Plunkett of Mamroneck.

Police are stepping patrols in Mamaroneck and increasing their presence while trying to connect the string of attacks.

“His method of operation…telling his victims to get down on the ground, face down on the ground and threatening them with a weapon,” New Rochelle Police Capt. Joseph Schaller said.

Schaller said the more serious incidents appear to be by the same attacker — in a black ski mask, dressed in black, armed with a handgun. Robberies are up 100 percent in New Rochelle from this time last year.

“We, at this point, kind of attribute it to the weather. Last year we were in the middle of several blizzards and snowstorms,” Schaller said.